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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>learn_ball_GAME</title>
</head>
<body>
  <canvas id="cnv"></canvas>
  <div id="home">
    <h1>ball_game</h1>
    <p>a simple ball game</p>
    <hr>

    <!-- the main body -->
    <div class="content">
      <div class="key">
        <p>
          <code>w</code>up
        </p> 
        <P><code>S</code>down</P>
        <P><code>A</code>left</P>
        <P><code>D</code>right</P>
        <P><code>The left mouse button</code>bullets bui bui bui~~</P>
      </div>

      <div class="play hidden">
        <input type="text" id="username-input" placeholder="username"></input>
        <button id="play-button">Play</button>
      </div>
      <div class="connect">
        <p>连接服务器中</p>
      </div>
    </div>


  </div>
</body>
</html>